#include<stdio.h>
#define PI =3.14
main(){
	int r = 0;
	printf("请输入圆的半径：\n");
	scanf("%d",&r);
	printf("圆的面积为：%d \n",area(r));
	printf("圆的周长为：%d \n",leght(r));
}
int area(int r){
	int conarea;
	conarea=3.14*r*r;
	return conarea;
}
int  leght(int r){
	int conleght;
	conleght=2*3.14*r;
	return conleght;
}
